Horse and donkey models are outdated in survival mode, but appear correctly in creative mode

When playing in Survival Mode, horses appear using the replaced texture from before Version 1.2.6. The same problem also occurs with donkeys, as well as an occasional glitch that causes their ears to appear invisible, as shown in one of the attached screenshots. The screenshot that shows the donkey with its ears was taken after I saved, quit, and reentered the game.